Division of Compensation Analysis and 

Support

Program Evaluation Report

Document Number: DCAS-PER-038

Effective Date: 7/24/2012

Revision No. 0

Hooker Electrochemical TBD Revisions Page 1 of 5

Author: Signature on file Date: 7/24/2012 

 Dave Allen, HP Team Leader

Approval: Signature on file Date: 7/24/2012 

 J.W. Neton, Associate Director for Science

Supersedes: None

RECORD OF ISSUE/REVISIONS

ISSUE 

AUTHORIZATION 

DATE

7/24/2012

EFFECTIVE 

DATE

7/24/2012

REV. NO. 

0

DESCRIPTION

New document to determine which 

previously completed claims require 

evaluation for the affect of revising the 

Hooker Electrochemical TBD.

1.0 Description

A Hooker Electrochemical site specific appendix to Battelle-TBD-6001 (Appendix AA) 

was issued 6/15/2007. This was superseded by a stand-alone Technical Basis Document 

(TBD) on 4/4/2011 (DCAS-TKBS-0009 rev. 0). On 6/16/2011, revision 1 was issued to 

that document to correct an error.

2.0 Issue Evaluation

The changes made in revision 1 of the TBD caused external doses to operators to 

decrease during the operational period. No increase in any doses occurred in revision 1. 

Revision 0 however, did result in some increased dose when compared to Appendix AA. 

Therefore, Appendix AA is compared to Revision 1 in this PER in order to itemize the 

increased dose.

Intakes rates and external dose rates are assigned based on the type of job an employee 

performed. Different doses are assigned in the operational period than the residual 

period. Also, units used in Appendix AA are different than those used in the TBD. 

Therefore, a detailed listing of intake rates and external dose rates are included in 

Attachment A. Appendix AA values were converted to the same units used in the TBD 

to make comparison easier.

Uranium intake rates assigned during the operational years in Appendix AA depended on 

the type of job an employee performed. In revision 1, all employees are assigned the 

same intake rate. The revision 1 intake rate is slightly lower than the Appendix AA 

intake rate for operators but higher for everyone else. 
Division of Compensation Analysis and 

Support

Program Evaluation Plan

Document Number: DCAS-PER-038

Effective Date: 7/24/2012 Revision No. 0 Page 2 of 5

External dose rates assigned during operational years in Appendix AA are higher than 

those assigned in revision 1 of the TBD. Therefore, operational year external dose was 

not evaluated further in this PER. 

Uranium intake rates assigned during the residual contamination period in Appendix AA 

are identical to the intake rates assigned in revision 1 of the TBD. Therefore, residual 

period internal dose was not evaluated further in this PER. 

External dose rates from photon radiation assigned in the residual contamination period 

in Appendix AA are higher than those assigned in revision 1 of the TBD. However, the 

external shallow dose rates are higher in the residual period in revision 1 to the TBD.

Therefore, the dose assignments that increased in the current revision compared to 

previous documents are:

 Uranium intakes during the operational years for everyone not originally assigned 

the operator intakes (labeled Plant Floor High intakes in Appendix AA).

 Shallow dose rates during the residual period for all job categories.

3.0 Plan for Resolution or Corrective Action

Based on the issues described above, two populations of claims potentially affected by 

these revisions were determined. The first population was based on the following 

criteria:

1. Probability of Causation (PC) less than 50%

2. Most recent version of the dose reconstruction approved by DCAS on or prior to 

April 4, 2011 (issue date of revision 0 of the TBD. Revision 1 decreased doses 

from there).

3. Employed at the Hooker Electrochemical between 1946 and 1976 (residual 

period).

4. Diagnosed with a skin cancer (only the shallow dose was increased).

These criteria identified total of 14 claims. These cases were evaluated further as 

discussed below. 

The second population of potentially affected claims was developed from the following 

criteria:

1. Probability of Causation (PC) less than 50%
Division of Compensation Analysis and 

Support

Program Evaluation Plan

Document Number: DCAS-PER-038

Effective Date: 7/24/2012 Revision No. 0 Page 3 of 5

2. Most recent version of the dose reconstruction approved by DCAS on or prior to 

April 4, 2011 (issue date of revision 0 of the TBD. Revision 1 decreased doses 

from there).

3. Employed at the Hooker Electrochemical between 7/11/1944 and 1/15/1946 

(operational period).

These criteria identified total of 39 claims. These claims were reviewed to determine if 

the intake assigned in the dose reconstruction was higher or lower than that assigned in 

revision 1 of the TBD. Thirty three of the claims reviewed were determined to have been 

assigned the “Plant Floor High” intake rate from Appendix AA. The intake rate in 

revision 1 is slightly lower than that so these claims required no further evaluation. The 

remaining six claims were evaluated further as discussed below. 

3.1 Determination of claims which will not change due to TBD revision. 

For the twenty claims requiring further evaluation, dose was recalculated using all current 

dose reconstruction methods including the current version of the TBD. From that 

recalculated dose, a new probability of causation was determined. The probability of 

causation remained below 45% for 19 of the 20 claims. The probability of causation for 

the remaining claim fell between 45% and 50%. In accordance with NIOSH procedures, 

IREP was run 30 times with 10,000 iterations for each run. The final probability of 

causation was still below 50% and slightly lower than the original probability of 

causation.

As a result of this review, the revisions to the Hooker Electrochemical TBD did not result 

in the probability of causation of any previously completed claims rising to greater than 

50%. A listing of those claims evaluated and their final disposition will be forwarded to 

the Department of Labor.
Division of Compensation Analysis and 

Support

Program Evaluation Plan

Document Number: DCAS-PER-038

Effective Date: 7/24/2012 Revision No. 0 Page 4 of 5

Attachment A – Comparison of Assigned Doses and Intake Rates

The “Plant Floor High” job category in Appendix AA is equivalent to the “Operator” job 

category in the TBD. The “Plant Floor Low” job category in Appendix AA is equivalent 

to the “Laborer” job category in the TBD.

Inhalation Intakes

App. AA Rev 0 Rev 1

Operational - Operator 343 dpm/day 340 dpm/day 340 

dpm/day

Operational - Laborer 172 dpm/day 340 dpm/day 340 

dpm/day

Operational -

Supervisor

85.8 dpm/day 340 dpm/day 340 

dpm/day

Operational - Clerical 8.58 dpm/day 340 dpm/day 340 

dpm/day

Residual – All 2.2 dpm/day 2.2 dpm/day 2.2 

dpm/day

Ingestion intakes are proportional to the inhalation intakes in each revision

Appendix AA inhalation rates converted from pCi/day to dpm/day

External Gamma

App. AA (mr/year) Rev 0 (mr/year) Rev 1 

(mr/year)

Operational - Operator 147 14.755 1.885

Operational - Laborer 73.4 0.455 0.455

Operational -

Supervisor

36.9 0.228 0.228

Operational - Clerical 3.69 0.0228 0.0228

Residual - Operator 137 0.455 0.455

Residual - Laborer 68.6 0.455 0.455

Residual - Supervisor 34.3 0.228 0.228

Residual - Clerical 3.43 0.0228 0.0228

Appendix AA values converted from mr/day to mr/year
Division of Compensation Analysis and 

Support

Program Evaluation Plan

Document Number: DCAS-PER-038

Effective Date: 7/24/2012 Revision No. 0 Page 5 of 5

External skin (other than hands and forearms)

App. AA (mrem/year) Rev 0 

(mrem/year)

Rev 1 

(mrem/year)

Operational - Operator 358 334.5 69.9

Operational - Laborer 179 40.5 40.5

Operational -

Supervisor

87.6 20.3 20.3

Operational - Clerical 7.3 2.03 2.03

Residual - Operator 0 40.5 40.5

Residual - Laborer 0 40.5 40.5

Residual - Supervisor 0 20.3 20.3

Residual - Clerical 0 2.03 2.03

Appendix AA values converted from mrem/day to mrem/year

External skin (hands and forearms)

App. AA (mrem/year) Rev 0 

(mrem/year)

Rev 1 

(mrem/year)

Operational - Operator 4015 1310.5 167.5

Operational - Laborer 2007 40.5 40.5

Operational -

Supervisor

986 20.3 20.3

Operational - Clerical 110 2.03 2.03

Residual - Operator 0 40.5 40.5

Residual - Laborer 0 40.5 40.5

Residual - Supervisor 0 20.3 20.3

Residual - Clerical 0 2.03 2.03

Appendix AA values converted from mrem/day to mrem/year